Answer:
1. What is the TYM? 7.64%
2. What is the YTC?: 7.36%
3. 3. If interest rates are expected to remain constant, what is the best estimate of the remaining life left for RTE Incs bonds? : 8 yrs
As the YTC is lower than YTM the company will purchase the bonds 
4. If RTE issued new bonds today, what coupon rate must have to be issued at par? 7.64%
The bonds will need to be issued at market to be at par.
Step-by-step explanation:
We solve for the YTM and YTC considering they are the sum of the coupon payment and maturity or call price which maches the current market price:
YTM
 
C 90.000
time 18
rate 0.076433667
 
PV $864.7491 
 
 
 
 Maturity 1,000.00 
 time 18.00 
 rate 0.076433667
 
 
 PV 265.60 
 
PV c $864.7491 
PV m $265.6006 
Total $1,130.3497 
YTC
 
C 90.000
time 8
rate 0.073634141
 
PV $529.9297 
 
 
 
 Maturity 1,060.00 
 time 8.00 
 rate 0.073634141
 
 
 PV 600.42 
 
PV c $529.9297 
PV m $600.4203 
Total $1,130.3500